Can you elaborate your theories in practical terms? Have you actually designed a PS with 40 MHz bandwidth or more?
What do you mean "fast response time"? ns?
I have never seen a 100 MHz PS from China or anywhere, have you?
What do you mean "fast response time"? ns?
I have never seen a 100 MHz PS from China or anywhere, have you?
newbie (ish) question
Hi guys
Have been modding a Marantz CD63KI for some time but get totally confused by all the conflicting advice on regulators.
I have installed 4 simple LM317 based 5v regs using small tants for decoupling on small individual boards directly next to load around the DAC/Decoder section, which is after the caps etc on the PCB.
I have seen banks of these regs built on a board at the edge of the CDP and fed by twisted wires to the load.
I want to use better regs but my budget and skills are limited, so I think I need to build LM317/337 based regs with gyrators and use better decoupling/smoothing caps.
Is it better to have the reg as close to the load as possible?
Should I connect the reg through, say Blackgates to the load, and if so should the cap be nearest the reg or the load?
Hope you can sort me out because I keep coming back to this and asking on other threads but no one seems to want to answer.
Thanks in anticipation.
Jim
Hi guys
Have been modding a Marantz CD63KI for some time but get totally confused by all the conflicting advice on regulators.
I have installed 4 simple LM317 based 5v regs using small tants for decoupling on small individual boards directly next to load around the DAC/Decoder section, which is after the caps etc on the PCB.
I have seen banks of these regs built on a board at the edge of the CDP and fed by twisted wires to the load.
I want to use better regs but my budget and skills are limited, so I think I need to build LM317/337 based regs with gyrators and use better decoupling/smoothing caps.
Is it better to have the reg as close to the load as possible?
Should I connect the reg through, say Blackgates to the load, and if so should the cap be nearest the reg or the load?
Hope you can sort me out because I keep coming back to this and asking on other threads but no one seems to want to answer.
Thanks in anticipation.
Jim
Re: newbie (ish) question
Yes, better to have the regulator close to the load.
Caps: depends of the regulator. Look at the regulator datasheet for the type of caps to use. If you plan to reg digital, you can find many regulators better than the old LM317 (lower noise, faster transient).
Good luke.
jimh0612 said:
Yes, better to have the regulator close to the load.
Caps: depends of the regulator. Look at the regulator datasheet for the type of caps to use. If you plan to reg digital, you can find many regulators better than the old LM317 (lower noise, faster transient).
Good luke.
Thanks for that stef.
Any suggestions for replacements for the LM 317 for a 5v digital rail in a CD player?
Regards
Jim
Any suggestions for replacements for the LM 317 for a 5v digital rail in a CD player?
Regards
Jim
jimh0612 said:
LT1086 (or LM1086) will be a good upgrade. Others exist but pinout will not be the same.
I'm not sure that you will listen a difference specially on the 5v digital rail.
.
I ran the test again -- previously I had used 6V Alkalines -- this time a pair of motorcycle batteries:
An externally hosted image should be here but it was not working when we last tested it.
Just re-reading this ancient thread -- actually a purring diesel engine ain't bad !
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